package notwork;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class UdpEchoServer_2 {
   private DatagramSocket socket=null;

    private UdpEchoServer_2(int port) throws SocketException {
        socket=new DatagramSocket(port);
    }

    public void start() throws IOException {
        System.out.println("服务器启动");

        while (true){
            DatagramPacket requestPacket=new DatagramPacket(new byte[4096],4096);
            socket.receive(requestPacket);
            String request=new String(requestPacket.getData(),0, requestPacket.getLength());
String reponse=process(request);
DatagramPacket reponsePacket=new DatagramPacket(reponse.getBytes(),
        reponse.getBytes().length);
socket.send(reponsePacket);
            System.out.printf("[%s:%d]   res:%s   rep:%s\n",request,requestPacket.getPort(),request,reponse);
        }
    }
    private String process(String request){
        return request;
    }

    public static void main(String[] args) throws IOException {
        UdpEchoServer_2 udpEchoServer_2=new UdpEchoServer_2(8989);
        udpEchoServer_2.start();
    }

}
